It is mainly used as antirust and corrosion inhibitor for metals(such as silver, copper, lead, nickel, zinc, etc.), widely used in the antirust oil products, as gas-phase corrosion inhibitor for copper and copper alloy, as treating agent for recirculating water, as antifreezer for cars, antidust for photograph, stabilizer for macromolecular compound, growth regulator for plant, lubricant additive, absorbant for ultraviolet ray, etc. It can be used together with many kinds of scale inhibitors and bactericide and algaecide, showing excellent anticorrosion effect in close recirculated cooling water system.